DUALITY TRANSFORMATIONS, GREEN DYADICS AND PLANE-WAVE SOLUTIONS FOR ACLASS OF BIANISOTROPIC MEDIA

Duality transformations are defined as linear transformations between pairs of vector fields and sources. A class of bianisotropic media is defined so that a pair of duality transformations can be found which l eave the media invariant (self dual). It is seen that for such media t he permittivity, permeability and nonreciprocity parameters must be mu ltiples of the same dyadic while the chirality parameter may be an arb itrary dyadic. Any source and field in such a medium can be decomposed in a pair of self-dual components which see the bianisotropic medium as two equivalent anisotropic media of affine-isotropic type. The Gree n dyadics in these two media can be solved through affine transformati ons and the Green dyadics of the original bianisotropic medium can be written in explicit analytic form. The plane-wave dispersion equation can be solved through a similar self-dual decomposition of fields.